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Question

What is the wavelength of light emitted when the electron in a hydrogen atom undergoes transition from an energy level with n = 4 to an energy level with n = 2?

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Solution

The ni = 4 to nf = 2 transition will give rise to a spectral line of the Balmer series. The energy involved in the transition is given by the relation,
E=2.18×1018[1n2i1n2f]
Substituting the values in the given expression of E:
E=2.18×1018[142122]=2.18×1018[1416]=2.18×1018×(316)
E = – (4.0875 × 1019 J)
The negative sign indicates the energy of emission.
Wavelength of light emitted (λ)=hcE(since E=hcλ)
Substituting the values in the given expression of λ:
λ=(6.626×1034)(3×108)4.0875×1019λ=4.8631×107mλ=4.8631×109mλ=486nm


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